Obtaining Energy and Removing Waste

After this process, the structures used to move the nutrients throughout the animal’s body depend on the type of circulatory system the animal has.

• absorption

• crop

• gizzard

• digestion

Some animals store their food here before digesting it.

• absorption

• crop

• gizzard

• digestion

Animals that do not have teeth but eat hard foods have these structures.

• absorption

• crop

• gizzard

• digestion

This process occurs as food moves through the digestive system.

• absorption

• crop

• gizzard

• digestion

Many birds, insects, leeches, snails, and earthworms store undigested food here.

• absorption

• crop

• gizzard

• digestion

Some animals and birds that have these structures swallow rocks along with their food to help break up the food.

• absorption

• crop

• gizzard

• digestion

Nutrients are obtained from food through excretion.

• True

• False

Excretion is vital to survival because it removes harmful substances from the body.

• True

• False

Animals that eat only meat have just one type of teeth.

• True

• False

The organ used by land animals to excrete carbon dioxide

• lungs

• kidneys

• pores

• feces

• urea